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2025

Predictions for new physics in the CMB damping tail

Smith, Tristan L., Schöneberg, Nils

Understand

Ever since the Planck satellite measured the the cosmic microwave background (CMB) down to arcminute angular scales, the mismatch between the CMB-inferred value of the Hubble constant and the value inferred from the distance ladder (i.e., the Hubble tension) has been a growing concern and is currently at the $\sim 6 \sigma$ level.

There are a handful of proposed mechanisms operating in the early universe which have shown some promise in resolving the Hubble tension.
These mechanisms are expected to leave a measurable impact on the smallest scale CMB anisotropy, deep in the damping tail.
Using current CMB data, baryonic acoustic oscillation data, and the luminosities of Type Ia supernovae as a baseline, we compute the predicted small-scale CMB power spectra for a characteristic set of these models.